How frequent are these gravity events during a time period when an airliner isn’t crashing?
Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
11–20 of 42 posts
Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#12"But just how long the Boeing 777 jet could have stayed airborne would depend on its actual flight path, its altitude and how many of its four engines were operating." Don't the 777s have 2 engines?
3 including the APU
The APU on a 777 provides truly negligible trust; the exaust from the APU is on the left side, not centered, so if it were providing meaningful thrust it would inducing a yaw moment.
Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#13Earlier quoted context omitted.
3 including the APU
The APU on a 777 provides truly negligible trust; the exaust from the APU is on the left side, not centered, so if it were providing meaningful thrust it would inducing a yaw moment.
I think the point is that it draws fuel which reduces the endurance by a small amount
Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#14>But the ocean is a noisy place, and Kadri said the underwater sounds might have also been caused by underwater earthquakes... Seismic is rough. Even large earthquake events are localized with large error because of constant noise - seismic event arrivals are hard to pinpoint precisely in time. On top of that, once we have arrival times from a bunch of seismometers(microphones) localization is an inversion problem, d…
For the curious, & because I did the math for myself:
1k mile radius is 3.14 million square miles. The oceans are 140 million square miles.
Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#15http://mh370.radiantphysics.com/2018/11/17/ocean-infinity-fi...
“Unfortunately, the acoustics generated by the impact of MH370 on the ocean surface would not propagate along the “deep sound channel” (DSC) the way an underwater acoustic event does, so the impact likely was not detected by CTBTO sensors.” - suggests this is unlikely, although not detailed explanation
Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#16I'm surprised that no mention was made of the U.S. Navy's network of hydrophones (SOSUS) and whatever took its place in the late 1990s. SOSUS was quite successful at detecting a number of Russian submarines since the 1950s with every new generation thereof. In any event, I can only imagine that there would be U.S. government resources (military and otherwise) that could have provided some surveillance information on…
I wonder how much information, if any, is withheld by military organizations in various countries. I presume a particular country doesn’t want to give away their latest radar capabilities or what have you by disclosing tracking information whether it’s through satellite systems or through sub-ocean sonar.
You don't have to disclose capabilities in a press release honestly unless you really, really need to convince people that you're not falsifying the information or trying to mislead people - there is almost no incentive I can think of to mislead people on a general civilian search mission though. A government could simply point some lowly persons to the general area without any explanation of its methods, put almost no official support in funding the search, and it could relieve a great deal of pain and suffering should it lead to findings. The issue may come down to all the scrutiny that could happen were the information lead to the discovery of the plane and (presumably) its passengers. I'm not aware of any government issuing statements like this though in any capacity honestly. It is probably better to assume that our governments, while powerful, are not without their limitations whether it's bureaucracy, technicalities, or simple funding limits.
Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#17I'm surprised that no mention was made of the U.S. Navy's network of hydrophones (SOSUS) and whatever took its place in the late 1990s. SOSUS was quite successful at detecting a number of Russian submarines since the 1950s with every new generation thereof. In any event, I can only imagine that there would be U.S. government resources (military and otherwise) that could have provided some surveillance information on…
SOSUS (according to the public maps) is very focused on the Pacific and Atlantic oceans and a lot around Russian territorial waters. The network is probably a bit denser than represented on the map but there's not much need for it in the Indian Ocean. https://upload.wikimedia.org/wikipedia/commons/f/fc/Sosus_ma...
(according to the public maps) is a good disclaimer to add. If you believe those maps, they are basically disregarding the Persian Gulf for example, to a degree that I find wildly inconsistent with the volume and intensity of US diplomatic, political and military intervention in the area. I strongly suspect they've got the whole area mic'd, but under a new program that's "deployment-specific" and more secret. But if they were to offer their observations to the search effort, they would be exposing the existence and possibly the locations of any hydrophones.
Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#18Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#19Earlier quoted context omitted.
3 including the APU
4 including the Ram Air Turbine (RAT)
The RAT is not an engine and doesn’t deploy unless all other engines have shutdown in flight, and it induces drag because it’s a kind of ‘wind turbine’ that drops into the airstream and generates electrical power (and maybe hydraulic pressure)
Re: Ocean Microphones May Have Recorded Lost Malaysian Jet's Crash
#20Previous analysis of CTBTO hydrophone data (augmented with IMOS, Australian SOSUS clone) back in 2014: https://www.nature.com/news/sound-clue-in-hunt-for-mh370-1.1...